They are so cute at that size. I lined the bottom of the cage with newspaper under the coir fiber and Riley has already dug down and shredded the newspaper in his hide area. Obviously not a good idea on that one. For his hide area I use an unglazed clay pot turned upside down with a side broken out the clay pot will hold some moisture too. Mine does seem to like this substrate better than the hay I was using he likes digging in it and it must feel better to walk on.